Final answer:
The two liability coverage extensions under the commercial auto policy are out-of-state coverage and supplementary payments, which help adapt the policy to other states' requirements and cover additional expenses related to a claim. Option D is correct.
Step-by-step explanation:
The question asks about the two liability coverage extensions under the commercial auto policy. The correct answer is D. Out-of-state coverage and supplementary payments are the two liability coverage extensions.
Out-of-state coverage adapts the insurance policy to meet other states' minimum insurance requirements if they are higher than the policy's limits, while supplementary payments cover various additional costs associated with an insurance claim, such as bail bonds, loss of earnings, and other related expenses incurred during the defense of a claim.